Axis - A straight line around which something turns. , Axle - A shaft that runs through the center of a wheel , Friction - A force between objects that are touching each other that opposes their motion, slowing them down., Pattern of motion - A manner in which objects move due to their structures., Ramp - An object that has a slope., Rotate - To turn or Spin, Shaft - A long, thin structure that can be used as an axle or axis., Slope - A surface that is higher on one end, System - Two or more objects that work together in a meaningful way., Wheel - An object that is circular and revolves on an axle to enable it to move more easily over the ground., Wheel and Axle system - A simple machine made of a wheel fixed to a shaft, or axle; both the wheel and axle rotate together.,

2.2 patterns of motion

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